Henry Ruggs will be able to have a Thanksgiving meal during his first major holiday behind bars if he wants it ... 'cause TMZ Sports has learned the ex-NFL star is being offered a full turkey dinner in prison Thursday.
A spokesperson for the Nevada Department of Corrections tells us ... inmates throughout the state -- including Ruggs -- will be offered roast turkey, mashed potatoes, gravy, stuffing and more in celebration of the November holiday.
"Normal operations and special meal," the spokesperson said.